Coffee maker



March 23, 1954 l. JEPSON ETAL COFFEE MAKER 2 Sheets-Sheet 1 Original Filed March .5, 1937 March 23, 1954 Original Filed March 5, 1957 l. JEPSON EI'AL Re. 23,

COFFEE MAKER 2 Sheets-Sheet 2 81 as 103 1 5 u 96 a3 99 6*) INSUL A T/OW Reissued Mar. 23, 1954 COFFEE MAKER Ivar Jepson, Oak Park, and George Browning,

Wilmette, 111., assignors to Sunbeam Corporation, a corporation of Illinois Original No. 2,269,111, dated January 6, 1942, Se-

rial No. 129,163, March 5, 1937. Renewed April 4, 1940. Application for reissue November 15, 1952, Serial No. 320,844

32 Claims. (01. 219-43) Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue specification; matter printed in italics indicates the additions made by reissue.

This invention relates to cooking devices, and in many aspects deals more particularly with electric coffee makers.

An important object of the invention is the provision of a coffee maker of generally improved form having a novel arrangement of parts operative in the making and serving of coffee.

Another object of the invention is the provision of a cofieemaking device having improved control means.

Another object of the invention is the provision or a cofiee maker having coffee making and coilee storing or serving elements and heating means for these elements adapted to maintain a predetermined temperature for making coffee and a different predetermined temperature for storing the coffee.

A still further object of the invention is the provision of a coffee maker of the type wherein the coffee liquor is formed by the passage of water through a bed of coffee wherein means are provided for passing the water through the bed at substantially a predetermined and uniform rate of flow and under a predetermined pressure, together with pressure controlled means for regulating the extraction temperature.

We have also aimed to provide a coffee maker of the type having at making pot and a serving pot, wherein novel means are employed for transferring the coffee liquor from the making to the serving pot.

We have further aimed to provide an extraction unit 01' improved characteristics.

Another object of the invention is the provision in a coffee maker of improved means for controlling the heating means to produce a novel cycle 01' operations.

Another object of the invention is the provision of a novel method for making coffee.

An important object of our invention is to provide an automatic coffeemaking device in which the functions are controlled by pressure responsive means and temperature responsive means. A further important object of our inveniton is 'to provide an automatic cofieemaking device-characterized by operations of making the codes and keeping the coifee heated for serving, and the provision of heating means for controlling said operations in combination with control mechanism for the heating means including a pressure responsive control for the cofiecmaking operation and a temperature responsive control for the serving period.

Other objects and advantages will appear during the course of the following description and from the accompanying drawings, in which- Figure l is a side View of a coffee maker embodying our invention, some of the parts thereof being shown in section;

Fig. 2 is a top viewof the device shown in Figure 1; V

Fig. 3 is a fragmentary vertical section through the base and the lower part of the making pot;

Fig. 4 is a bottom view of that portion of the base shown in Fig. 3 with the bottom cover plate removed, and

Fig. 5 is a wiring diagram.

Our invention in its broader aspect contemlates the provision of a coffeemaker in which the coffeemaking functions are automatically performed after the device is started by the operator and the coffee liquor is automatically kept heated for serving. The automatic operations are effected by novel control of the heating means characterized by pressure responsive means which maintains control of the heating means during the cofieemaking period and tem perature responsive means which subsequently takes over control of the heating means in a period for serving the coffee. The coifeemaking and serving structure, together with the coacting heating means and the control mechanism may be constructed in various ways to perform the desired automatic operations. In the present application we have shown one embodiment "of our invention in which the automatic control includes pressure responsive means which controls heating of the water and displacement thereof from a heating vessel to a container for the ground coffee in which infusion of the coffee takes place. The control mechanism may further include temperature responsive means arranged to automatically take over control of the heating means to keep the coffee liquor at the desired temperature, or approximately $0, for serving. v

The embodiment of the invention Qherein shown includes a base designated generally by the numeral ii having a plurality of legs 1, a

making pot designated generally by the numeral 8, and a serving pot a, the making pot being fixedly attached to the base, and the serving pot 9 being capable of ready removal from the base for the purpose of serving the coffee liquor contained therein. The base 6 is formed, in this instance, from sheet metal to provide an ornamental supporting annular side wall I l to which the legs 1 are attached and a top surface member |2 forming a heat conducting member. The heat conducting member has a pair of laterally spaced top recesses I3 and I4, the recess |4 being of somewhat greater depth than the recess 13. Cylindrical side walls |5 of the making pot 8 are seated in the recess I4 (Fig. 3), the lower edges of the walls abutting against the heat conducting member i2. A recessed bottom member it is seated between the walls l5 and forms the bottom for the pot 8. This bottom member likewise provides a recess for the reception of a heating element I! held in position by means of a pressure plate l8 which is interposed between the heating element and the heat conducting member |2 at the bottom of the recess ii. The heating element serves to heat the contents of the making pot 8 and simultaneously to heat the heat conducting member I2 for a purpose which will presently appear.

A handle l9 preferably of insulation material I such as synthetic resin, is aflixed to the side of the making pot 8 adjacent the top thereof and above the end of the base 6, as best shown in Figs. 1 and 2. The upper ends of the side walls I 5 are rolled inwardly as shown at 2| for the purpose of providing a seat at the upper open end of the pot 8. Positioned within the pot 8 is a coffee liquor cup 22 of such size as to be completely received in the upper part of the pot 8, the cup 22 being flared outwardly adjacent its upper edge, as shown at 23, for the purpose of forming a ring-like chamber 24, as will presently appear. The upper edge of the liquor cup 22 is flanged, as shown at 25, and has seated thereon a rubber or other resilient gasket 26, the flange 25 and gasket 26 having shape characteristics for seating against the open upper end of the pot 8, as best shown in Figure l. Axially disposed with respect to the cup 22 is a delivery tube 21 which passes through the bottom of the cup 22 and extends from a point closely adjacent the bottom member l6 of the pot to an elevated point in the cup 22, as shown at 28. It will be noted that when the gasket 26 is firmly seated on the upper end of the pot, the tube 21 comprises the only means of communication between the lower side of the cup 22 and the upper side thereof,

the cup thus forming a water chamber designated generally by the numeral 29.

A sheet metal cover designated generally by the numeral 3| has an annular shoulder 32 adapted when the cover is positioned on the top of the pot to abut against the upper side of the gasket 26 and an annular flange 33 extending downward along the outer edge of the gasket to cover and the flange 23 of the cup 22 in forming the chamber 24, and a rib 36 adapted to receive and support a gasket 31 of rubber or other suitable resilient material. the top and has a threaded bore}! {or the A thimble 38 is axially positioned in .4 reception of a screw 4| carrying a knob 42. A conical pressure portion 44 encircles the screw 4| and is adapted to engage against a conical seat 15 on a strap 46 when the screw is threaded out of the bore 39. The strap 46 is arcuate in shape and has its ends journaled in the wall l5 of the pot 8 for rotation on a transverse axis from a position to one side of the pot to the position shown in Figs. 1 and 2. The strap has a slot 41 for reception of the screw 4| when the strap occupies the position shown in Figure 1. It will be seen that by rotating the knob 42 the screw 4| may be threaded out of the thimble, thus applying pressure between the shoulder 25 of the top, the gasket 26, and the top edge of the pot 8 so as to seal the junction between these elements. The complementary conical portions 24 and 45 serve to center the strap 45 on the screw 4| and to prevent the strap from creeping under rotative movement of the screw.

The lower end of the thimble 38 has a threaded portion 68 of reduced cross-section providing a shoulder 49, these elements acting to support a cofiee container or cup 5| on the top. The cup 5| has cylindrical side walls 52 and a perforated fiat bottom 53, the upper edges of the side walls being rolled as shown at 54 for abutment against the gasket 31. A sleeve 55 extends upward axially in the cup and at its upper end has an internally threaded portion 56 arranged to cooperate with the threaded portion 48 to draw the upper edges of the cup firmly against the gasket and thus produce a water-tight joint. Other devices may be employed to produce a seal between the coffee container and the cup 22 with satisfactory results. The sleeve 55 is of such internal. diameter as to closely receive the upper end of the delivery tube 21, and is provided with a plurality of small openings 58 above the upper end of the tube 21, the openings being uniformly distributed annularly of the sleeve such that water passing upward through the tube 21 will be uniformly discharged from the sleeve in all directions.

The operation of the coffee making pot is substantially as follows: The cover 3| and attached cup 5| are removed from the top of the pot releasing the cup 22, gaskets 25 and tube 21, which are then removed from the pot. The required amount of water is then placed within the water chamber 29 through the open end of the pot. The cup 22 with its attached tube 21 and gasket 26 are then dropped into the end of the pot. The cofiee cup 5| is unscrewed from the cover and the required amount of coffee is inserted into the cup. A filter paper 59 may be inserted across the perforated bottom 53 if desired, The coffee cup 5| is then again attached to the cover with the upper edge 54 thereof firmly abutting the gasket 31, whereupon the cover and attached cup are lowered into the liquor cup 22 with the sleeve 55 passing over the upper end of the tube 21. A lug 5| is positioned on the outer side of the wall 55 and cooperates with the flange 33 of the cover to locate the cover on the pot. Current is then supplied to the heating element l1 and when sufiicient steam pressure is generated within the water chamber 29, the water will be forced up the tube 21 and out through the openings 58 onto the coffee into the cup 5|, filling this cup and forcing the hot water through the bed of coffee and out through the erforations in the bottom 53. The coffee liquor resulting from this extractionoperation passes upwardly between the outer wall of the cup5| and the inner wall of the cup 22 into the annular chamher Ind-rand thence :toian opening. 62 in the iiischargingsintoca spout 8 attaches to the cover rr'omw lnic'h the coffee liquor is discharged into a. pouring spolrt '64 ot the serving pct 19. when of the water thus been displaced from chamber :25, :siteam under some pressure will ifnllow onward through the tube 2 causing the remainder of the liquid to be displaced from the cup @I and from the chamber It surroundin the cup 5l leaning these elements at the -'close of the coffee making operation substantially free :ofilicmid' The serving pot 8 is r's'uhsta-ntialiy identical in outer appearance with the making pot *8, with the exceptions-i the spouts and 6 4. The serv- .ing pet has cylindrical side walls 6 5, a bottom 66, and a handle '61-, the handle being the counterpart of the handle 19 and likewise located. The pot has a cover 6'3 substantially similar in shape to the cover 331-, a strap 69 pivotally supported on the side walls of the pot as shown at l' l and similar to the strap 4 6, a knob T2 similar to the knob 42, and a screw "[3 -'shaped, located, and operated in the same manner as the screw -4 l=-. Positioned on the side wall of the pot opposite the handle 6! is the spout 51! which extends substantially from top to bottom of the pot as shown in Figure 1. This spout provides a channel for the "reception -'of the coffee liquor from the making pot, the liquor being discharged 'slig htlybelow the flared outer end it of the pouring spout. side Wall 65 of the serving pot is provided with a relatively large opening T5 at the lower en'd of the spout [i5 and with a 're'la-- 'tively large "opening '16 adjacent the top of the spout. A plurality of smaller openings H are located below "the opening [6 but adjacent the npper end of the spout '94. Through the provision of the openings 15, 16 and "[1 spaced in the manner shown in Figure 1, the coiiee entering the serving pot is givena "considerable degree of turbulence since a par-t of the liquor will enter through the opening "F5, an additional part through the openings 71, and the remainder through the opening T5. Through this arrangement uniformity of the coffee liquor in the serving pot is obtained as a result-of its discharge into the pot. This arrangement prevents stratification oi the nodes liquor in the serving pot. It will be understood that otherwise the cofiee liquor discharged from the discharge spout =63 may be of di ii'eren t character during the early part of the coffee maker operation from that discharged during thel'aitter part. In fact, in some instances the discharge from the spout 63 may run practically clear at the end of the coiiee making operation.

It will be seen that the serving pot B is arranged for convenient removal and replacement on the base '6, and that the base 6 and serving pot are arranged for convenient replacement of the pot in the proper location and space arrangement with respect to the making pot 8. Thus the serving pot seats in the "recess I3 of the heat conducting member 1'2 which acts to locate the lateral position of the pot. At the same time the discharge spout 63 "is received in the pouring spout 6-1! in such manner that the serving pot maybe raised vertically to a limited extent suflito permit the pot to be tilted so that the bottom thereof may be removed from the recess l3 and the pot transported as desired in the dispensing :of the coffee. The relationship be- -tween spouts H3 and $4 is, however, such that the entire coffee maker my be handled by grasping the handle 61 since verticalmovement of "the put 9 :is permitted to only a limited extent. Because of this iimit in the relative vertical movement of the pots, the coffee maker may be handled as a unit by simultaneous :manipulation of the-handles I9 andfi-T.

lIt will 'be seen that because of the location of the serving pot i9 upon the heat conducting plate 12, the heating element 1"! is not only effective to heat the contents of the making Jpot, abut also eflective to heat the coffee stored in the serving not. To accomplish "this and other 112-- we have provided novel control means for the heating element which effective to control the notice making operations and the heating of the stored coffee. "330 "this "end we provide a pressure responsive element .13 positioned in the bottom its for the making pot adapted to actuate "a pin IQ-carriedin a sleeve 8| passing through the bottom Ni, the heating element H, the plate M, and the heat conducting member 122, and thus extending into the hollow base t (Fig. .3). "The pressure responsive element T8 is arranged to move the pin 1'9 downwardly racing Fig. .3 upon increasing 'temperature against the tension of spring 81, the spring acting to return the pin upon decrease of pressure. A plate 82 is fattaeh'ed to the heat conducting member 12 by means of bolts and is arranged to "carry switch mechanism for opening and closing the circuit to the heating element =17. Positioned on the plate 82 and insulated therefrom are bus-bars 8'4 and 85 (Fig. a) carrying terminal posts 86 of conventional form for attachment to a source of current supply. Electrically connected to the bus-bar 84 is a pressed contact lever 85 having contacts 88 and "8B. Opposed to the contact 38 is a stationary contact 9'! electrically connecte'd'to one terminal of the heating element by a connector member 92. The opposite term inal of "the heating element is connected to the bus-bar through a connector 93 and consequently, when the contacts 8 8. and 91' are made, current will flow through the hea'ti-nglem'ent H and when opened, current will cease to flow. The lever 81 is tensione'd in such a manner as to close'these contacts if unrestrained. Aswitchactuating lever M is 'jou-rnaled on cars 95 "as shown at 96 and carries at its free end a button?! of insulation material such a porcelain. intermediate the ends of the lever 9'4 and in cooperative relationship with the pin F9 is an adjusting screw and nut "9 3 which may be set to predeten mine the relationship between the position of the pin 19 and the'button 9'; so that at a predetermined pressure within the ma-hing pot, the button will be forced against the contact lever Bi opening the contacts &8 and 9| and terminating the flow of current through the heating element, thereby rendering the heating of the making pot responsive to the pressure with-in the pot. Opposed to "the contact is a contact 9 9 carried a spring-pressed blade NH supported on 'a connect-or (-92 attached to the plate 82 and ins-u i'ate'd therefrom. The con-tact '99 is electrically connected to a lamp bulb Hit, the 'circuit'through which is completed through the connector 93 and bus-bar B5. A lens or window I 04 is positioncd-in the heat conducting plate 12 between the two pots so a to render the light from the lamp l-"Eii visible from the exterior of the base. A bi-metal blade 111 5 is attached to the heat con-ducting member I 2, passing through the plate T8 and heating element t"! as shown in Fig. 3

"in such manner that the surface of the blade contacts the lower surface of the heat conducting member when the element is cold. The free end of the bi-metal element has a button Hit of suitable insulation, an example of which may be porcelain, adapted upon increase in temperature of the member [2 and heating element to come into contact with the contact blade ml and force this against its normal spring pressure so as to close the contacts 89 and 99, whereupon current will flow through the lamp, as will be obvious from Fig. 5. Upon a small further increase in the temperature of the bi-metal element and consequent additional movement thereof the contact 88 will be moved against the tension of its spring support so as to open the contacts 88 and 89, thereby cutting off the heating element. Likewise, when the bi-metal element cools slightly the contacts 88 and 59 will again be made and the heating element energized, this cycle being repeated to maintain substantially uniform temperature. During this cycle the contacts 89 and 99 will remain continuously closed.

The control mechanism is so set that the opening and closing of the contacts 88 and BI is entirely under the control of the pressure responsive means While there is water in the making pot. In one suitable example the pressure mechanism is arranged so that the contact points will be opened when the pressure in the making pot is in the region of four to five pounds, and the bi-metal element is set to open the contact points when the bi-metal blade reaches a temperature in the neighborhood of 225 F. Through this arrangement we are enabled to maintain a predetermined low temperature during the coffee making operations and a predetermined higher temperature upon the completion of the coffee making operations for the purpose of conducting heat to the serving pot through the heat conducting plate 12. These temperatures are relative only to the particular embodiment of our invention here shown, it being manifest that in this case the water will be heated sufliciently for the coffee infusion process but not to such a high temperature as to cause extraction of injurious or objectionable oils from the ground coffee, and that the above mentioned higher temperature of the bi-metal blade at the time of opening the contact points is reached only during the second control period and after the coffeemaking operation has been completed and the coffee liquor is being kept heated for serving. The said higher temperature of the bi-metal blade is utilized in this embodiment only because of the remote association of the containing means for the coffee liquor, that is, the use of a liquid containing means including as a component thereof a serving pot in heat transfer relation to and spaced at one side of the heating element so that there is considerable temperature lag in the transfer of heat from the heating means to the serving pot. With this construction the temperature responsive means operates in a range to keep the coffee liquor heated for serving and the actual temperature of the coffee liquor will be lower than the temperature to which the water is heated in the coffeemaking operation. It will be seen that the pressure element 18 will be effective to open and close the switch formed by the contacts 88 and 9| so long as water remains in the making pot. However, as pressure is developed on the water in the water chamber 29, the water is displaced upward through the delivery tube 21 and out of the pot, as heretofore described, the rate of-delivery of the water through the tube 21 and the rate of its passage through the bed of ground coffee will be held substantially constant in response to the constant pressure maintained in the water chamber as a result of the recurrent opening and closing of the circuit by the pressure responsive means. When all of the water has been displaced, the excess steam will likewise pass out through the tube 21, whereupon the pressure on the pressure responsive element 18 will drop substantially to atmospheric, permitting the closing of the switch. Thereupon the heating element is energized and the temperature surrounding the heating element will increase until the switch is opened by operation of the bi-metal element I05. This element will then function in the manner described to maintain a substantially uniform temperature of the heat conducting member i2 and maintain the coffee stored in the serving pot at a substantially uniform temperature.

Itwill be seen that because of the nature of the control mechanism, we are enabled to employ a heating element of high wattage capable of bringing the water in the making pot to a boiling temperature in very short time, thus reducing to a minimum the time required for the making of coffee, since the pressure responsive mechanism functions to control the heating element at the moment the required temperature is reached to produce the nicety of operation required in the production of good coffee. In other Words, during the period in which the water is being brought up to a suitable temperature for the making of coffee, we are enabled to have an abundance of heat which is promptly reduced to a relatively small amount when the water reaches the required temperature. Likewise, when the making of the coffee has been completed, the control means automatically and in response to the completion of the coffee making operations produces additional heat for the purpose of heating the serving pot. During the actual extraction operation the pressure control mechanism acts to maintain a substantially uniform pressure and therefore a substantially uniform rate of flow through the coffee, as distinguished from an increasing rate of flow such as would otherwise occur as a result of which the desired material is extracted from the coffee and the undesirable portion allowed to remain.

Attention is directed to the fact that the entire operation of the coffee maker is automatic in that the water and coffee are placed in the making pot and current supplied to the device. In other words, the operator places the device in condition for operation by adding the required amount of water and ground coffee and then starting the automatic operation by plugging in or connecting the terminals 86 to the current supply. Thereafter it is not necessary for the operator to do anything prior to the serving of the coffee, but merely to pick up the serving pot and pour the coffee liquor.

Attention is directed to the construction of the extraction portion of the coffee making pot in that the coffee or the coffee liquor never comes into contact with the pot proper so that this portion of the device never needs to be washed. In cleaning the device it is only necessary to remove the cups 22 and 5| and the cover 3| which may be conveniently washed and replaced. This is further facilitated by the fact that the steam which comes through these parts of the device at the end of the coifee making operation forces case-r substantiallyall off the waterand" coffee liquor outyofthe cups so that these; elements are substantiallyfree from liquid; upon the termination of the colfeemaking operations; This facilitates the removal of theccfiee grounds from the cup 51, andalso prevents aftcrdripping from the spout 63-. thecoffee making operation there is no remaining liquid within the pot to drip from the spout 63 when theserving pot i-sremoved from beneath thisspout.

Another feature of the invention lies in the construction of the pouring spout 6'4 wherein the vertically spaced openings iH-' are provided which brings about uniformity in the eof-fee in the serving pot. Likewise, this spout cooperates with the spout 63 and the handles HP and 6-1 in transporting the coifee maker asa- Another feature of our invention is the provision for automatically controlling the coffeemakingoperation by pressure responsive meansand temperature responsive means. The pressure responsive means functions in a first period for controlling the-heating means during the coffeemakingoperation and; the temperature responsive means functions in a second period to control the heating means to keep the coffee liquorheated to an approximate temperature forserving. In the preferred embodiment the automatio control mechanism functions so that the temperature responsive means takes over thecontrol after the coffeemaking operation been con-ipleteci under control of the pressure responsive means; Another feature of our invention is that the pressure: and temperature re-- sponsi-ve controls are coordinated for the purpose of efi'ecti'ng prompt change of control at a predetermined time in the coffeemaking operation soas to avoid undesirable high temperatures and undesirabletemperature lagsuch cofleemaking operation. In the preferred embodiment. the temperature responsive means takesover the control of the heating means after the pressure responsive means becomes ineffective at the endor the. cofi'eemaking operation. It should be manifest that the principlesof control for air-.- tomatic cofieemaking herein disclosed may be applied in various modifications.

lit wilt also be observed: that in the embodiment.

herein disclosed the signal light I03. is on. only when the coffee. completely made and ready for serving. In other'words, this lightis: on con-. tinuously so longas. there is coffee being heated in the server. This. continuousv light. i due. to. the action of the thermostat I105 against. the con-. tacts 89.--9.& and: the flexibility oil the end. por.= tion of the spring 81 between the contacts. 8.8 and. 8L9 which is, suflicient to take care of lagin cooling so that. the light circuit stays: closed.v

It will be understoodv that. the foregoing de. scription and accompanying drawings are by wayof illustra-tion,- and we do. not wish to be limited; except as required by the prior art and the scope of the appended claims.

We claim:

1. A device of. the character described comprising in combination a serving pot adapted to hold cofiee liquor during a storage i-nterva1, making pot. arranged to make the cofiee and dischargethe liquor into the serving pot, means for heat-. ing said pots, and control means for said heating means for maintaining a predetermined making temperature during the making interval and, a predetermined diiferent temperature during the storagev interval- In other words, at, the conclusion ofv 2-. A device of the character described com;- prising a serving pot adaptedto hold cofleeliquor during a storage interval, a making pot arranged to make the coffee liquor and discharge the same into the serving pot, means for. eat; ing said pots, and control means for'the' heating means comprising means for maintaining a predetermined coffee making temperature; during the making interval, and mean rendered oper- I ati-ve in response to said discharge of' liquor'for maintaining apredetermi ed temperature during; the storage interval.

3. A device of the character described comprising a base having aheatconducting member, a making pot and a serving pot positioned on: said: member, an electric heating element in said base in close proximity to said making pot and more remote from said serving pot, and control means for said heating element for maintaining the member at a predetermined lower temperature formaking coffee in the making potandthereafter at a predetermined higher temperature for keeping the liquor in the serving potat a serving temperature.

4. A. device of the character described comprising a serving pot, a. making pot adaptedto hold water having a cofiee container, and means; for conducting water under pressure from said pot through said coffee container and to the serving pot, means for heating said making pot to develop pressure therein, and control means for said heating element comprising pressure responsive means for maintaining apredetermined pressure in the making pot during the passageof water therefrom to control the rate of passage of the wate through. said coffee container.

5. A device of the character described compris ing a serving pot, a making pot adapted to holdwater having a cofiee container, and means for conducting water under pressure through a single cycle from said pot through said coffee container and to the serving pot, means for heating said making pot to. develop pressure therein, control means for said heating element comprising pressure responsive means: for maintaining a predetermined pressure in the making pot during the passage of water therefrom, and temperature responsive means for controlling said element after the passage of the water from the making pot,

6. A device of the character described com! prising a serving pot, a making; pot. adapted to hold Water having a cofiee container, and means for conducting water under pressure from said: pot through said coffeecontainer and to the serving pot, means. for heating said making pot to develop pressure therein, control means for said heating element comprising pressure responsive means for maintaining a predetermined pressure in the making pot during the passage of water therefrom, temperature responsive means for controlling said element after the passage of. the water from the making pot, and signal means. operative in response to passage of liquid from one pot to the other for indicating whenv the Water has passed from the making pot.

7. The combination in a coifee maker of a serving pot, a making pot adapted to discharge coffee liquor into the serving pot, heating means; for said pots, means for maintaining a predet ire mined temperature in the making pot themaking of coffee therein, signal means, and means responsive to the increase of temperature of the making pot to initiate the signal means to indicate the completion or" the coffee making operations.

8. The combination in a coffee maker of a base having a heat conducting member, a serving pot located thereon, a making pot thereon adapted to prepare and discharge ooiiee liquor into the serving pot, a heating element for said heat conducting member in direct heat conducting relation to the making pot and more remote from said serving pot to heat the making pot for the coffee making operations and the serving pot for storage of the liquor, means for controlling said element in response to pressure in the making pot during the making of coffee, and tem perature responsive means for indicating the completion of the making operations and for controlling said element to heat the serving pot.

9. The combination in a coffee maker of the type having a serving pot, a making pot and means for conducting water from the making pot to the serving pot at a predetermined pressure in the making pot, of a heating element for heating said pots, contacts for controlling the flow of current to said element, means for actuating said contacts in response to changes in pressure in said making pot to maintain a predetermined pressure during the making of coffee liquor, and means for actuating said contacts solely in response to temperature changes to maintain a predetermined temperature of said serving pct.

10. The combination in a coiiee maker of the type having a serving pot, a making pot and means for conducting water from the making pot to the serving pot at a predetermined pressure in the making pot, of a heating element for heating said pots, contacts for controiliing the flow of current to said element, means for actuating said contacts in response to in pressure in said making pot to maintain a predetermined pressure during the making of coffee liquor, signal means, signal contacts for contrclling the flow of current thereto, and means ren dered operative in response to absence of water in the making pot for closing said signal contacts and for actuating said first mentioned contacts in response to temperature changes.

11. The combination in a coffee maker of a making pot adapted to hold water and discharge the same upon the development of steam pressure thereabove to prepare a coitee liquor, a serving pot positioned adjacent thereto for the reception of said liquor, a heating element for said making pot, means for heating the serving pot by conduction from said heating element, switch means for controlling said heating element, means responsive to the changes in pressure within the making pot for actuating said switch to maintain a predetermined pressure therein, and thermostat means rendered operative in response to the discharge of water from said making pot for actuating said switch for maintaining a predetermined temperature adjacent said element to heat said serving pot.

'12; The combination in a coffee maker of it making pot adapted to hold water and discharge the same upon the development of steam pres sure thereabove to prepare a cofiee liquor, a serving pot positioned adjacent thereto for the re ception of said liquor, a heating element for said making pot, means for heating the serving pot by'conduction from said heating element, switch means for controlling said heating element, means responsive to changes in pressure within the making pot foractuating said switch .to

maintain a predetermined pressure therein, thermostat means rendered operative in responsive to the discharge of water from said making pot for actuating said switch for maintaining a predetermined temperature adjacent said element to heat said serving pot, and signal means operated by said thermostat means for indicating when the heating element is under the control of said thermostat means.

13. The combination in a coffee maker having a heating element, of control means comprising a spring-pressed contact carrier having spaced contacts, one of said contacts serving to open and close the circuit through said heating element, pressure responsive means for actuatin said carrier to control the last mentioned contact, signal means, a movable contact opposed to the other of the contacts on said carrier, and thermostat means for moving said movable contact into engagement with said other contact to energize said signal means and subsequently to move said contact carrier to control said heating element.

14. A cooking device comprising in combination a serving pot adapted to hold coffee liquor during a storage interval, a making pot arranged to make the cofiee and discharge the liquor into the serving pot, means for heating said pots, and control means for said heating means for maintaining a making temperature during the making interval and a different temperature during the storage interval.

[15. A cofieemaking device having a container for ground coffee, liquid containing means including a vessel in which water is adapted to be heated and pressure generated for delivery of the heated water to the ground coffee container in performance of the cofieemaking operation, said liquid containing means adapted to receive the coifee liquor after infusion in the ground cofiee container, electric heating means associated with the liquid containing means for heating the water in said cofieemaking operation, and a control for said electric heating means to cause electric current to flow through the heating means for performance of said coffeemaking operation and having means responsive to pressure in the water container to maintain said flow of electric current to the heating means in predetermined relation to said pressure whereby to maintain substantially uniform rate of flow of the heated Water from the Water container to the cofiee container and whereby to quickly terminate said flow of electric current upon sudden drop of said pressure due to delivery of substantially all of the water to the coiiee container.]

16. A coffeemaker having a container for the ground coffee, a container for the water, means for heating the water, means associating said containers so that hot water is delivered from the water container to the coifee container in the operation of making the coffee, a control for said heating means including pressure responsive means responsive to pressure in the water container to control the cofieemaking operation and including temperature responsive means to automatically take control of said heating means after the functioning of said pressure responsive means to keep the coffee liquor heated for serv- 17. An automatic coffeemaking device inc1uding a. container for ground cofiee in which infusion of hot water and the ground coffee takes place, liquid containing means including a vessel in which water is adapted to be heated for desome.

liv ry to; the coffee container in the; operation. of making the. coffee and in which means.- the cofiee liquor is subsequentlystored for serving, electric heating means for heating said liquorcontaining means, and control mechanism for the heating means including means responsive to, pressure in the said; vessel to automatically control the heating means through the cofieemaking operation and thermally responsive means tosubsequently automatically control said. heating means to keep the coffee liquor heated for serving.

18. An automatic cofieemaking device having a. lower vessel, an upper vessel, a: tube depending from the upper vessel into the lower vessel, electric. heating, means for heating; water the lower vessel and causing the water to be delivered. through saidtube into the upper vessel, control. means, responsive to pressure within the lowervessel to automatically efiect change of heat. transfer to the lower vessel at a. predetermined. high pressure in the delivery of water through the tubeto the upper vessel, and temperature responsive. means toautomatically effect recurrent, increase and reduction of heat transfer from said heating means to maintain the device within a temperature range different. from that of said control means for keeping the cofiee heated for serving.

19. An automatic coiieemaking device including acontainer for ground coffee in which infusion of hot water and the ground coffee takes; place, liquid containing means, including a vessel in which water is adapted to be. heated for deliveryby pressure. to the coffee. container in the operation of making; the coifee, said: liquid containing means. also being adapted for holding the. coffee liquor for serving, electric heating. means. for heating said liquid containing means, and control mechanism for the heating means including circuit interrupting contacts. operable to open. and closev the: circuitfor all heat: control operations, means responsive to. pressure within the liquid containing means: to. automatically control said contacts. within a. predetermined temperature range untilsubstantially all of the water has been delivered to. the ground coiieecontainer, and means responsive to. temperature of the device to automatically control said contacts; within: a. predetermined temperature range different from said first mentioned temperature rangeto keep the cofiee liquor heated: for serving.

20. An automatic. coileemaking: device includ ing; a. container for ground coffee in which in fusion of hot water and the ground coffee takes place, liquid containing means including a vessel in which water is adapted: to. be heated for (lolivery by pressure to the coffee container in the operation 01. making the coffee, said. liquid containing means also. being adaptedfor holding the coffee; liquor for serving, electric heating means for heating. said liquid containing means, and control mechanism for the heating means including a. circuit for the heating means having a single set: of circuit interrupting contacts operable to open and close the circuit for: all heat control operations, said contacts being biased to closed position for starting the coffeemaking operation, means. responsive to pressure in the liquid containing means to automatically control said contacts within a predetermined temperature range-until substantially all of the water has been delivered to the ground coffee container, and means responsive to temperature of the de- I4! vice tcawtomaticallpcontrol contacts a. predetermined temperature. range diflerent frQmsaid first mentioned temperature, range to. keep the: coiijee liquor.- heated for serving.

21; An automatic cofieemaking. device in the water is. heated by electric heating means and delivered to.- the ground coffee by pres sure generated by such heating; in a calico-1 makin operation and; in. which the cofiee: liquor is delivered from the ground coiTee ready for serving including control mechanism for the electric heating means. having means responsive: to said pressure for controlling the. cofieemaking operation. and means automatically operative fol-lowing said coifeemaking' operation and ire-- sponsive to temperature: of the, device for controb ling the temperature at, which the coffee liquor: is kept for serving...

22. A eoffeemaking device including a com ta-iner for ground ccifee, liquid. containing: means in. which. water is adapted to be heated and from which it is displaced. by pressure to the ground coffee container in the operation of making the coffee, electric heating means for heating the liquid containing means and. causing the water to be. so displaced, and control mechanism for the heating means including contacts. for intei rupti-ng the heating circuit, said contacts being closed to start the heating of the water, means responsive to pressure in the vessel to automatically control the operation of said circuit in the operation of making the cofiee, and, means responsive to predetermined low and high tome peratures of the liquid; containing means to auto-- matically recurrently close and open. the heating circuit after the cofiee has: been made to keep the coffee liquor heated for serving...

23. A colieemaking device having means for automatically controlling the operations of making the coflee and keeping the coffee heated tor serving, including a vessel which water is. adapted to be heated and: from which. it. isdis placed by pressure for infusion with. the ground coffee in the operation of making the coffee electric heating means for heating the vessel and causing the water to be; sodisplaced, a circuit for the heating means including circuit: interrupting; contacts, a diaphragm responsive to pressure within the vessel during said cofl'ee making operation to open said contacts at a predetermined pressure, and athermostat responsive. to; temperature of the. vessel to operr. and close said contacts, said circuit being automatically controlled; by the: pressure responsive diaphragm duringthe cofieemaking operation and; being automatically controlled: by said tempera.- ture: responsive means. after said functioning of; the pressure responsive diaphragm; tokeep the coffee liquid heated for serving.

24. An automatic coffeemaking devicehaving in combination, a container forground coffee, liquid containing means, including a. vessel in. which water is adapted to be heated and. pressure generated for delivery of the heated. water to the ground coffee container in performance. of the coife'em'aking operation, said liquid con.- taining means adapted to receive the. cofiee. liquor after infusion in the ground coffee con-- tainer, heating means associated with said liq uid containing means and operable through a. first. period for heating the water in, the codesmaking operation and through a second period after the. coffee. is, made for keeping the cofi'ee. liquor heated {0,17 serv na means, operable, tov

start the heating means for starting said first period of operatio and control mechanism to subsequently automatically control the heating means including means responsive to pressure in said vessel to control the heating means in the coifeemaking operation, and said control mechanism including means responsive to predetermined low and high temperatures of the device to control the heating means to keep the coffee liquor heated in said liquid containing means for serving.

25. A coffeemaking device having, in combination, a container for the ground coffee, liquid containing means including a vessel closed except for a passage communicating with said container, electric heating means associated with said liquid containing means adapted to operate in a first period to heat water in said vessel and cause it to be delivered to said container by pressure within the vessel for infusion with the ground coiiee and to operate in a second period to heat the coffee liquor after the latter has been delivered from said container to the liquid containing means for serving, and control mechanism for the heating means including means responsive to pressure in said vessel for controlling said first period of operation and means automatically operative following said first period of operation and responsive to temperature of the device for controlling said second period of operation.

26. A coffeemaking device having means for automatically controlling the operations of making the coffee and keeping the coffee at an approximate temperature for serving, including liquid containing means in which the water is adapted to be heated and from which it is displaced in the operation of making the coffee, the liquid containing means serving also to hold the coffee liquor after the coffeemaking operation, electric heating means for heating the liquid containing means and causing the water to be displaced in the coffee-making operation, a circuit for the heating means including circuit interrupting means, control mechanism for said circuit interrupting means to control the coffeemaking operation in a first period and to maintain the coffee liquor at a serving temperature in a second period, and a signal means actuated by said control mechanism to effect a signal only for said second period.

27. In a cooking device, a pressure vessel for use in the cooking operation, electric heating means for heating said vessel, a pressure responsive control for said heating means to maintain a predetermined pressure in said vessel during the cooking operation, and temperature responsive means to prevent overheating of the vessel after the vessel becomes dry.

28. In a cooking device, in combination, a food container, a vessel associated therewith in which water is adapted to be heated for performance of the cooking operation, electric heating means for heating said vessel, and control mechanism for the heating means including means responsive to the pressure in said vessel resulting from heating the water, said pressure responsive means serving to control said heating means through the cooking operation and being inefiective to perform its said control function when the pressure in said vessel drops below a given point, and said control mechanism including means responsive to temperature of the device to automatically take over control of said heating means after the control thereof by said pressure responsive means to maintain the device within a predetermined temperature range.

29. In combination, a vessel, electric heating means for heating the vessel, and a control for the heating means comprising a circuit having a switch biased to closed position, a diaphragm responsive to pressure within the vessel generated by heating the contents thereof, a switchactuating lever operable between the diaphragm and the switch to recurrently open and close the switch to maintain a predetermined pressure and temperature range within the vessel, and thermally responsive means including a thermostat responsive to temperature of the vessel and arranged to automatically take over control of said switch when the pressure in the vessel drops below a predetermined point, the thermostat acting to recurrently open and close the switch to maintain the vessel at a predetermined temperatime range different from that effected by said pressure control.

30. The combination set forth in claim 29, including an adjustment between the. diaphragm and the switch-actuating lever to predetermine' the relationship between the postion of the dia phragm and the lever so that the lever will cause the switch to open the circuit at a predetermined pressure within the vessel.

31. The combination set forth in claim 29, including a signal in the circuit and a switch for the signal arranged in coaction with the thermally responsive means to be continuously closed when said thermally responsive means is in control of the heater switch.

32. A coffeemaking device having in combination, a container for ground coifee, liquid containing means including a vessel in which water is adapted to be heated and pressure generated for delivery of the heated water to the ground coffee container in performance of the coffeemaking operation, said liquid containing means adapted to receive the coffee liquor after infusion in the ground coffee container, electric heating means associated with the liquid containing means and operable through a first period for heating the water in the coffeemaking operation and through a second period after the coffee is made for keeping the coffee liquor heated for service, and control mechanism responsive to pressure within said vessel to control the electric heating means to maintain substantially uniform rate of flow of the heated water from the vessel to the ground cofiee container during the cofieemaking operation, said control mechanism including thermostat means adapted to take over control of the electric heating means following said coiieemaking operation and responsive to predetermined low and high temperatures of the device to control the heating means to keep the coffee liquor heated in said liquid containing means for serving.

33. The automatic cofieemaking device of claim 17 wherein said means responsive to pressure is operat ve to maintain a substantially uniform rate of flow of heated water from said, liquid containing means to said container for ground coffee.

IVAR J EPSON. GEORGE BROWNING.

(References on following page) References Cited in the file of this patent or the original patent UNITED STATES PATENTS Number Name Date Ciletti Feb. 8, 1916 Clark Sept. 6, 1921 Lambert Sept. 2, 1930 Wells Aug. 1, 1933 Challis Aug. 15, 1933 10 Goughnour Oct. 17, 1933 Olds Dec. 24, 1935 Ross Jan. 7, 1936 Harper Jan. 19, 1937 Number Number Name Date Keaton May 17, 1938 De Ayala May 31, 1938 Keaton Mar. 14, 1939 Scott Aug. 15, 1939 Graham Mar. 19, 1940 Keaton Aug. 20, 1940 Jepson et a1 Jan. 6, 1942 FOREIGN PATENTS Country Date Great Britain Dec. 30, 1893 France Nov. 6, 1902 Germany June 16, 1925 

